The nonprofit legal group is warning travelers to stay away from the Lone Star State after it passed a law that allows cops to ask about a person’s immigration status during routine stops.

“We plan to fight this racist and wrongheaded law in the courts and in the streets. Until we defeat it, everyone traveling in or to Texas needs to be aware of what’s in store for them,” said ACLU of Texas executive director Terri Burke in a statement. “The Lone Star State will become a ‘show me your papers’ state, where every interaction with law enforcement can become a citizenship interrogation and potentially an illegal arrest.”

The bill, known as SB4, also bans “sanctuary cities” in the state by requiring cops and elected officials to cooperate with federal immigration agents.